Pen clip barrel



FIG. 1 is a front bottom side perspective view of a pen clip barrel showing my new design;

FIG. 2 is a bottom plan view thereof;

FIG. 3 is a right side elevational view thereof which is a mirror image of the left side thereof, and,

FIG. 4 is a top plan view thereof.

The broken lines depicting environmental structure are included for illustrative purposes only and form no part of the claimed design. 

The ornamental design for a pen clip barrel, as shown and described. 